lambda what is

EFCore 连接MySQL数据库查询数据提示This MySqlConnection is already in use

EFCore 连接数据查询数据提示"This MySqlConnection is already in use"代码如下 using (MyDBContext db =new MyDBContext()) { Order order= db.Orders.Single(o => o.Id==2); ......

Vue报错 Error in destroyed hook: "TypeError: xxx is not a function”

## 问题 将项目npm run build打包以后,进入项目本地文件夹dist,打开index.html,页面空白并且报如下错误 ![image](https://img2023.cnblogs.com/blog/2911541/202308/2911541-20230830192813812-7 ......
TypeError destroyed function Error hook

CFG file is missing and source table is found to have row versions报错原因分析

参考: https://docs.percona.com/percona-xtrabackup/8.0/error-message-instant.html https://dev.mysql.com/doc/refman/8.0/en/innodb-table-import.html https: ......
原因分析 versions 原因 missing source

解决bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: ORA-00911: 无效字符

1、XTHS 实测,把sql 语句最后的; 去掉就可以了。在数据库工具中有这个分好是可以的,但是在mybatis中却不行 ### Cause: java.sql.SQLSyntaxErrorException: ORA-00911: 无效字符 ; bad SQL grammar []; nested ......

A disk is a bunch of bits

A disk is a bunch of bits Jul 19, 2023 Introduction Have you ever heard someone say that a disk or memory is a “bunch of bits”? I’m not sure about thi ......
bunch disk bits is of

Android Installed Build Tools revision 34.0.0 is corrupted. Remove and install again using the SDK

前言ERROR: Installed Build Tools revision 34.0.0 is corrupted. Remove and install again using the SDK Manager.错误:已安装的生成工具修订版34.0.0已损坏。使用SDK管理器删除并重新安装。 上 ......
Installed corrupted revision Android install

PyQt/PySide's qwindows.dll qwindowsvistastyle.dll is corrupted by UPX

Windows 10 64-bits Python 3.8.10 64-bits PySide2 5.15.2 PyInstaller 4.3 UPX 4.1.0 it raises: > "This application failed to start because no Qt platfor ......

el-input设置自动聚焦this.$refs.xxx.focus is not a function报错

![](https://img2023.cnblogs.com/blog/1202393/202308/1202393-20230829182654871-1880402926.png) * https://blog.csdn.net/qq_45821882/article/details/1323 ......
el-input function input focus this

Mybatis Plus报错: can not find lambda cache...

使用mybatisplus 时使用Lambda 表达式做查询条件会遇到mybatis拿不到缓存问题: > 错误1:com.baomidou.mybatisplus.core.exceptions.MybatisPlusException: can not find lambda cache for ......
Mybatis lambda cache Plus find

type.text is about to be deprecated in version 3.0.0, please use link instead.提示

问题:使用按钮类型为文字时,控制台报错type.text is about to be deprecated in version 3.0.0, please use link instead. 代码如下: <el-button type="text" size="small" @click="de ......
deprecated instead version please about

使用 Amazon Lambda 进行无服务器计算:云架构中的一场革命

引言 十年前,无服务器架构还像是痴人说梦。不再如此了! 有了 Amazon Lambda,我们现在可以建构和运行应用程序而不需要考虑服务器。云供应商会无缝地处理所有服务器的供应、扩展和管理。我们只需要关注代码。 这为云部署带来了前所未有的敏捷性、自动化和优化。但是,要发挥它的全部潜力需要对 Lamb ......
架构 服务器 Amazon Lambda

spring boot - 开启异步 @EnableAsync 启动报错 The bean 'xxx' could not be injected because it is a JDK dynamic proxy

解决 注解 @EnableAsync 修改为 @EnableAsync(proxyTargetClass = true) 如 ......
EnableAsync injected because dynamic spring

normalizeKey is not a function #element #vue #疑难杂症

normalizeKey is not a function #element#vue#疑难杂症 原因是组件中使用了 import { Search } from '@element-plus/icons-vue' 解决方案是,在 main.ts 中,将 Vue 的引入置顶。 // TOP impo ......
杂症 normalizeKey 疑难 function element

com.mysql.jdbc.PacketTooBigException: Packet for query is too large(windows)

使用mysql查询数据的时候报错: Caused by: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (1078 > 1024). You can change this value on the serve ......

原来 Lambda 这么简单

最开始学Java一直没搞懂lambda表达式,后面写项目时遇到流式处理也是懵懵懂懂,现在终于可以写清楚了,lambda本质就是只提取关键信息,从而简化代码 ......
Lambda

Docker|--E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation

### 错误 ```bash apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 871920D1991BC93C E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but ......
gnupg installed operation required Docker

解决:docker 443: connect: network is unreachable

1、配置镜像加速器 您可以通过修改daemon配置文件/etc/docker/daemon.json来使用加速器 sudo mkdir -p /etc/docker sudo tee /etc/docker/daemon.json <<-'EOF' { "registry-mirrors": ["h ......
unreachable connect network docker 443

Infinity: Set Theory is the true study of Infinity

AN INTRODUCTION TO SET THEORY - Professor William A. R. Weiss, October 2, 2008 Infinity -> Set Theory -> Mathematics Set Theory is the true study of I ......
Infinity Theory study true Set

UE4.27, Packaging failed, "is found in memory and is an export but does not have all load flags"

打包时发生如下错误 "is found in memory and is an export but does not have all load flags" 通过查阅论坛,问题原因出在,某类的构造函数里包含xxx->SetChildActorClass(ActualOne) 整理到的解决办法并未 ......
quot Packaging failed export memory

This TensorFlow binary is optimized to use available CPU instructions in performance-critical operations.

This TensorFlow binary is optimized to use available CPU instructions in performance-critical operations.To enable the following instructions: AVX2 FM ......

SharedArrayBuffer is not defined 问题的解决以及服务器https证书的配置

## 问题 前端使用了ffmpeg压缩组件,在运行项目出现 SharedArrayBuffer is not defined的问题,使项目不能正常运行,经过网上查询,需要在response加入以下的head: ```nginx Cross-Origin-Opener-Policy: same-ori ......

TypeError: clone.weekday is not a function

依赖库版本: vue3 + antd for vue v3.x dayjs version ^1.11.9 使用dayjs格式化表单中的日期控件值后,点击日期选择器直接报错 解决: 引入dayjs插件 ```js import dayjs from 'dayjs' import advancedFo ......
TypeError function weekday clone not

Java maven 工程报错:cannot be read or is not a valid ZIP file

原因:这个报错,其实jar包是个异常的jar。我是通过maven下载的后缀.lastupdate,然后我就直接把.lastupdate改成了.jar。 但是其实这个并不是实际意义上的jar包。 解决办法:找到匹配的jar包替换掉这个无效的jar包就可以了 ......
cannot 工程 maven valid Java

javax.xml.bind.JAXBException: class XXXX nor any of its super class is known to this context

[javax.xml.bind.JAXBException: class org.bouncycastle.jcajce.provider.asymmetric.x509.X509CRLObject nor any of its super class is known to this contex ......
class JAXBException context javax known

基于IS802的稳压BOOST

基于IS802的稳压BOOST 图1:IS802基本说明 IS802是类比半导体推出的用于驱动隔离电源的变压器驱动器,本身是没有反馈的根据输入电压来调节其输出。 要构建IS802为BOOST 电路基本架构如下 图2:IS802构建BOOST基本架构 图3:IS802构建的基本架构实物图 实测可以实现 ......
BOOST 802 IS

git中Updates were rejected because the tip of your current branch is behind解决方案

出现错误原因是操作过程中出现失误,git上进行的修改没有同步到本地的git仓库 解决方案:git push -u origin master -f 在远程仓库中进行的相关修改会被删除,是远程仓库回到你本地仓库为修改之前的版本。然后上传你本地仓库的修改。 注意:如果是多人开发则其他人的开发结果将会被恢 ......

Commit failed (details follow): Working copy text base is corrupt Checksum mismatch for text base of

问题:提交一个svn文件报错,提交其他文件没有报错 解决办法:(网上看了很多方法都解决不了): 1、把文件拷贝到svn目录外放着 2、把svn目录下文件移除,然后commit svn 3、把目录外的文件拷贝进来,先Add,然后commit 就成功了 ......
base text Checksum mismatch details

What is TLS ?

# TLS intrduction TLS是一种保障数据传输安全的一种技术(方案),它在传输层工作。 想知道TLS和SSL的关系,先看看他们的历史: - 人们遇到数据传输安全问题 - 1994 SSL 1.0 - 1995 SSL 2.0 - 1996 SSL 3.0 - 1999 TLS 1.0 ......
What TLS is

mysql导入sql文件“Index column size too large. The maximum column size is 767 bytes.”

问题分析 由于 MySQL 的 InnoDB 引擎表索引字段长度的限制为 767 字节,因此对于多字节字符集的大字段或者多字段组合,创建索引时会出现该问题。 说明 注:以 utf8mb4 字符集字符串类型字段为例。utf8mb4 是 4 字节字符集,默认支持的索引字段最大长度是 191 字符(767 ......
column size maximum 文件 mysql

apt-get update出现xxx is not signed

## 1、问题 ``` root@DESKTOP-Q86FNIK:~# apt update Get:1 http://mirrors.163.com/ubuntu bionic InRelease [242 kB] Err:1 http://mirrors.163.com/ubuntu bioni ......
apt-get update signed apt get